code:
// Components for manipulating sequences of characters -*- C++ -*-

// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
// 2006, 2007
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

/** @file basic_string.tcc
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

//
// ISO C++ 14882: 21  Strings library
//

// Written by Jason Merrill based upon the specification by Takanori Adachi
// in ANSI X3J16/94-0013R2.  Rewritten by Nathan Myers to ISO-14882.

#ifndef _BASIC_STRING_TCC
#define _BASIC_STRING_TCC 1

#pragma GCC system_header

_GLIBCXX_BEGIN_NAMESPACE(std)

  template<typename _Type>
    inline bool
    __is_null_pointer(_Type* __ptr)
    { return __ptr == 0; }

  template<typename _Type>
    inline bool
    __is_null_pointer(_Type)
    { return false; }

  template<typename _CharT, typename _Traits, typename _Alloc>
    const typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    _Rep::_S_max_size = (((npos - sizeof(_Rep_base))/sizeof(_CharT)) - 1) / 4;

  template<typename _CharT, typename _Traits, typename _Alloc>
    const _CharT
    basic_string<_CharT, _Traits, _Alloc>::
    _Rep::_S_terminal = _CharT();

  template<typename _CharT, typename _Traits, typename _Alloc>
    const typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::npos;

  // Linker sets _S_empty_rep_storage to all 0s (one reference, empty string)
  // at static init time (before static ctors are run).
  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::_Rep::_S_empty_rep_storage[
    (sizeof(_Rep_base) + sizeof(_CharT) + sizeof(size_type) - 1) /
      sizeof(size_type)];

  // NB: This is the special case for Input Iterators, used in
  // istreambuf_iterators, etc.
  // Input Iterators have a cost structure very different from
  // pointers, calling for a different coding style.
  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InIterator>
      _CharT*
      basic_string<_CharT, _Traits, _Alloc>::
      _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
		   input_iterator_tag)
      {
#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
	if (__beg == __end && __a == _Alloc())
	  return _S_empty_rep()._M_refdata();
#endif
	// Avoid reallocation for common case.
	_CharT __buf[128];
	size_type __len = 0;
	while (__beg != __end && __len < sizeof(__buf) / sizeof(_CharT))
	  {
	    __buf[__len++] = *__beg;
	    ++__beg;
	  }
	_Rep* __r = _Rep::_S_create(__len, size_type(0), __a);
	_M_copy(__r->_M_refdata(), __buf, __len);
	try
	  {
	    while (__beg != __end)
	      {
		if (__len == __r->_M_capacity)
		  {
		    // Allocate more space.
		    _Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
		    _M_copy(__another->_M_refdata(), __r->_M_refdata(), __len);
		    __r->_M_destroy(__a);
		    __r = __another;
		  }
		__r->_M_refdata()[__len++] = *__beg;
		++__beg;
	      }
	  }
	catch(...)
	  {
	    __r->_M_destroy(__a);
	    __throw_exception_again;
	  }
	__r->_M_set_length_and_sharable(__len);
	return __r->_M_refdata();
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    template <typename _InIterator>
      _CharT*
      basic_string<_CharT, _Traits, _Alloc>::
      _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
		   forward_iterator_tag)
      {
#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
	if (__beg == __end && __a == _Alloc())
	  return _S_empty_rep()._M_refdata();
#endif
	// NB: Not required, but considered best practice.
	if (__builtin_expect(__is_null_pointer(__beg) && __beg != __end, 0))
	  __throw_logic_error(__N("basic_string::_S_construct NULL not valid"));

	const size_type __dnew = static_cast<size_type>(std::distance(__beg,
								      __end));
	// Check for out_of_range and length_error exceptions.
	_Rep* __r = _Rep::_S_create(__dnew, size_type(0), __a);
	try
	  { _S_copy_chars(__r->_M_refdata(), __beg, __end); }
	catch(...)
	  {
	    __r->_M_destroy(__a);
	    __throw_exception_again;
	  }
	__r->_M_set_length_and_sharable(__dnew);
	return __r->_M_refdata();
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    _CharT*
    basic_string<_CharT, _Traits, _Alloc>::
    _S_construct(size_type __n, _CharT __c, const _Alloc& __a)
    {
#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
      if (__n == 0 && __a == _Alloc())
	return _S_empty_rep()._M_refdata();
#endif
      // Check for out_of_range and length_error exceptions.
      _Rep* __r = _Rep::_S_create(__n, size_type(0), __a);
      if (__n)
	_M_assign(__r->_M_refdata(), __n, __c);

      __r->_M_set_length_and_sharable(__n);
      return __r->_M_refdata();
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const basic_string& __str)
    : _M_dataplus(__str._M_rep()->_M_grab(_Alloc(__str.get_allocator()),
					  __str.get_allocator()),
		  __str.get_allocator())
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const _Alloc& __a)
    : _M_dataplus(_S_construct(size_type(), _CharT(), __a), __a)
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const basic_string& __str, size_type __pos, size_type __n)
    : _M_dataplus(_S_construct(__str._M_data()
			       + __str._M_check(__pos,
						"basic_string::basic_string"),
			       __str._M_data() + __str._M_limit(__pos, __n)
			       + __pos, _Alloc()), _Alloc())
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const basic_string& __str, size_type __pos,
		 size_type __n, const _Alloc& __a)
    : _M_dataplus(_S_construct(__str._M_data()
			       + __str._M_check(__pos,
						"basic_string::basic_string"),
			       __str._M_data() + __str._M_limit(__pos, __n)
			       + __pos, __a), __a)
    { }

  // TBD: DPG annotate
  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const _CharT* __s, size_type __n, const _Alloc& __a)
    : _M_dataplus(_S_construct(__s, __s + __n, __a), __a)
    { }

  // TBD: DPG annotate
  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const _CharT* __s, const _Alloc& __a)
    : _M_dataplus(_S_construct(__s, __s ? __s + traits_type::length(__s) :
			       __s + npos, __a), __a)
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(size_type __n, _CharT __c, const _Alloc& __a)
    : _M_dataplus(_S_construct(__n, __c, __a), __a)
    { }

  // TBD: DPG annotate
  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InputIterator>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(_InputIterator __beg, _InputIterator __end, const _Alloc& __a)
    : _M_dataplus(_S_construct(__beg, __end, __a), __a)
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    assign(const basic_string& __str)
    {
      if (_M_rep() != __str._M_rep())
	{
	  // XXX MT
	  const allocator_type __a = this->get_allocator();
	  _CharT* __tmp = __str._M_rep()->_M_grab(__a, __str.get_allocator());
	  _M_rep()->_M_dispose(__a);
	  _M_data(__tmp);
	}
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    assign(const _CharT* __s, size_type __n)
    {
      __glibcxx_requires_string_len(__s, __n);
      _M_check_length(this->size(), __n, "basic_string::assign");
      if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
	return _M_replace_safe(size_type(0), this->size(), __s, __n);
      else
	{
	  // Work in-place.
	  const size_type __pos = __s - _M_data();
	  if (__pos >= __n)
	    _M_copy(_M_data(), __s, __n);
	  else if (__pos)
	    _M_move(_M_data(), __s, __n);
	  _M_rep()->_M_set_length_and_sharable(__n);
	  return *this;
	}
     }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    append(size_type __n, _CharT __c)
    {
      if (__n)
	{
	  _M_check_length(size_type(0), __n, "basic_string::append");
	  const size_type __len = __n + this->size();
	  if (__len > this->capacity() || _M_rep()->_M_is_shared())
	    this->reserve(__len);
	  _M_assign(_M_data() + this->size(), __n, __c);
	  _M_rep()->_M_set_length_and_sharable(__len);
	}
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    append(const _CharT* __s, size_type __n)
    {
      __glibcxx_requires_string_len(__s, __n);
      if (__n)
	{
	  _M_check_length(size_type(0), __n, "basic_string::append");
	  const size_type __len = __n + this->size();
	  if (__len > this->capacity() || _M_rep()->_M_is_shared())
	    {
	      if (_M_disjunct(__s))
		this->reserve(__len);
	      else
		{
		  const size_type __off = __s - _M_data();
		  this->reserve(__len);
		  __s = _M_data() + __off;
		}
	    }
	  _M_copy(_M_data() + this->size(), __s, __n);
	  _M_rep()->_M_set_length_and_sharable(__len);
	}
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    append(const basic_string& __str)
    {
      const size_type __size = __str.size();
      if (__size)
	{
	  const size_type __len = __size + this->size();
	  if (__len > this->capacity() || _M_rep()->_M_is_shared())
	    this->reserve(__len);
	  _M_copy(_M_data() + this->size(), __str._M_data(), __size);
	  _M_rep()->_M_set_length_and_sharable(__len);
	}
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    append(const basic_string& __str, size_type __pos, size_type __n)
    {
      __str._M_check(__pos, "basic_string::append");
      __n = __str._M_limit(__pos, __n);
      if (__n)
	{
	  const size_type __len = __n + this->size();
	  if (__len > this->capacity() || _M_rep()->_M_is_shared())
	    this->reserve(__len);
	  _M_copy(_M_data() + this->size(), __str._M_data() + __pos, __n);
	  _M_rep()->_M_set_length_and_sharable(__len);
	}
      return *this;
    }

   template<typename _CharT, typename _Traits, typename _Alloc>
     basic_string<_CharT, _Traits, _Alloc>&
     basic_string<_CharT, _Traits, _Alloc>::
     insert(size_type __pos, const _CharT* __s, size_type __n)
     {
       __glibcxx_requires_string_len(__s, __n);
       _M_check(__pos, "basic_string::insert");
       _M_check_length(size_type(0), __n, "basic_string::insert");
       if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
         return _M_replace_safe(__pos, size_type(0), __s, __n);
       else
         {
           // Work in-place.
           const size_type __off = __s - _M_data();
           _M_mutate(__pos, 0, __n);
           __s = _M_data() + __off;
           _CharT* __p = _M_data() + __pos;
           if (__s  + __n <= __p)
             _M_copy(__p, __s, __n);
           else if (__s >= __p)
             _M_copy(__p, __s + __n, __n);
           else
             {
	       const size_type __nleft = __p - __s;
               _M_copy(__p, __s, __nleft);
               _M_copy(__p + __nleft, __p + __n, __n - __nleft);
             }
           return *this;
         }
     }

   template<typename _CharT, typename _Traits, typename _Alloc>
     basic_string<_CharT, _Traits, _Alloc>&
     basic_string<_CharT, _Traits, _Alloc>::
     replace(size_type __pos, size_type __n1, const _CharT* __s,
	     size_type __n2)
     {
       __glibcxx_requires_string_len(__s, __n2);
       _M_check(__pos, "basic_string::replace");
       __n1 = _M_limit(__pos, __n1);
       _M_check_length(__n1, __n2, "basic_string::replace");
       bool __left;
       if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
         return _M_replace_safe(__pos, __n1, __s, __n2);
       else if ((__left = __s + __n2 <= _M_data() + __pos)
		|| _M_data() + __pos + __n1 <= __s)
	 {
	   // Work in-place: non-overlapping case.
	   size_type __off = __s - _M_data();
	   __left ? __off : (__off += __n2 - __n1);
	   _M_mutate(__pos, __n1, __n2);
	   _M_copy(_M_data() + __pos, _M_data() + __off, __n2);
	   return *this;
	 }
       else
	 {
	   // Todo: overlapping case.
	   const basic_string __tmp(__s, __n2);
	   return _M_replace_safe(__pos, __n1, __tmp._M_data(), __n2);
	 }
     }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::_Rep::
    _M_destroy(const _Alloc& __a) throw ()
    {
      const size_type __size = sizeof(_Rep_base) +
	                       (this->_M_capacity + 1) * sizeof(_CharT);
      _Raw_bytes_alloc(__a).deallocate(reinterpret_cast<char*>(this), __size);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    _M_leak_hard()
    {
#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
      if (_M_rep() == &_S_empty_rep())
	return;
#endif
      if (_M_rep()->_M_is_shared())
	_M_mutate(0, 0, 0);
      _M_rep()->_M_set_leaked();
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    _M_mutate(size_type __pos, size_type __len1, size_type __len2)
    {
      const size_type __old_size = this->size();
      const size_type __new_size = __old_size + __len2 - __len1;
      const size_type __how_much = __old_size - __pos - __len1;

      if (__new_size > this->capacity() || _M_rep()->_M_is_shared())
	{
	  // Must reallocate.
	  const allocator_type __a = get_allocator();
	  _Rep* __r = _Rep::_S_create(__new_size, this->capacity(), __a);

	  if (__pos)
	    _M_copy(__r->_M_refdata(), _M_data(), __pos);
	  if (__how_much)
	    _M_copy(__r->_M_refdata() + __pos + __len2,
		    _M_data() + __pos + __len1, __how_much);

	  _M_rep()->_M_dispose(__a);
	  _M_data(__r->_M_refdata());
	}
      else if (__how_much && __len1 != __len2)
	{
	  // Work in-place.
	  _M_move(_M_data() + __pos + __len2,
		  _M_data() + __pos + __len1, __how_much);
	}
      _M_rep()->_M_set_length_and_sharable(__new_size);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    reserve(size_type __res)
    {
      if (__res != this->capacity() || _M_rep()->_M_is_shared())
        {
	  // Make sure we don't shrink below the current size
	  if (__res < this->size())
	    __res = this->size();
	  const allocator_type __a = get_allocator();
	  _CharT* __tmp = _M_rep()->_M_clone(__a, __res - this->size());
	  _M_rep()->_M_dispose(__a);
	  _M_data(__tmp);
        }
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    swap(basic_string& __s)
    {
      if (_M_rep()->_M_is_leaked())
	_M_rep()->_M_set_sharable();
      if (__s._M_rep()->_M_is_leaked())
	__s._M_rep()->_M_set_sharable();
      if (this->get_allocator() == __s.get_allocator())
	{
	  _CharT* __tmp = _M_data();
	  _M_data(__s._M_data());
	  __s._M_data(__tmp);
	}
      // The code below can usually be optimized away.
      else
	{
	  const basic_string __tmp1(_M_ibegin(), _M_iend(),
				    __s.get_allocator());
	  const basic_string __tmp2(__s._M_ibegin(), __s._M_iend(),
				    this->get_allocator());
	  *this = __tmp2;
	  __s = __tmp1;
	}
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::_Rep*
    basic_string<_CharT, _Traits, _Alloc>::_Rep::
    _S_create(size_type __capacity, size_type __old_capacity,
	      const _Alloc& __alloc)
    {
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 83.  String::npos vs. string::max_size()
      if (__capacity > _S_max_size)
	__throw_length_error(__N("basic_string::_S_create"));

      // The standard places no restriction on allocating more memory
      // than is strictly needed within this layer at the moment or as
      // requested by an explicit application call to reserve().

      // Many malloc implementations perform quite poorly when an
      // application attempts to allocate memory in a stepwise fashion
      // growing each allocation size by only 1 char.  Additionally,
      // it makes little sense to allocate less linear memory than the
      // natural blocking size of the malloc implementation.
      // Unfortunately, we would need a somewhat low-level calculation
      // with tuned parameters to get this perfect for any particular
      // malloc implementation.  Fortunately, generalizations about
      // common features seen among implementations seems to suffice.

      // __pagesize need not match the actual VM page size for good
      // results in practice, thus we pick a common value on the low
      // side.  __malloc_header_size is an estimate of the amount of
      // overhead per memory allocation (in practice seen N * sizeof
      // (void*) where N is 0, 2 or 4).  According to folklore,
      // picking this value on the high side is better than
      // low-balling it (especially when this algorithm is used with
      // malloc implementations that allocate memory blocks rounded up
      // to a size which is a power of 2).
      const size_type __pagesize = 4096;
      const size_type __malloc_header_size = 4 * sizeof(void*);

      // The below implements an exponential growth policy, necessary to
      // meet amortized linear time requirements of the library: see
      // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
      // It's active for allocations requiring an amount of memory above
      // system pagesize. This is consistent with the requirements of the
      // standard: http://gcc.gnu.org/ml/libstdc++/2001-07/msg00130.html
      if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
	__capacity = 2 * __old_capacity;

      // NB: Need an array of char_type[__capacity], plus a terminating
      // null char_type() element, plus enough for the _Rep data structure.
      // Whew. Seemingly so needy, yet so elemental.
      size_type __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);

      const size_type __adj_size = __size + __malloc_header_size;
      if (__adj_size > __pagesize && __capacity > __old_capacity)
	{
	  const size_type __extra = __pagesize - __adj_size % __pagesize;
	  __capacity += __extra / sizeof(_CharT);
	  // Never allocate a string bigger than _S_max_size.
	  if (__capacity > _S_max_size)
	    __capacity = _S_max_size;
	  __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
	}

      // NB: Might throw, but no worries about a leak, mate: _Rep()
      // does not throw.
      void* __place = _Raw_bytes_alloc(__alloc).allocate(__size);
      _Rep *__p = new (__place) _Rep;
      __p->_M_capacity = __capacity;
      // ABI compatibility - 3.4.x set in _S_create both
      // _M_refcount and _M_length.  All callers of _S_create
      // in basic_string.tcc then set just _M_length.
      // In 4.0.x and later both _M_refcount and _M_length
      // are initialized in the callers, unfortunately we can
      // have 3.4.x compiled code with _S_create callers inlined
      // calling 4.0.x+ _S_create.
      __p->_M_set_sharable();
      return __p;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    _CharT*
    basic_string<_CharT, _Traits, _Alloc>::_Rep::
    _M_clone(const _Alloc& __alloc, size_type __res)
    {
      // Requested capacity of the clone.
      const size_type __requested_cap = this->_M_length + __res;
      _Rep* __r = _Rep::_S_create(__requested_cap, this->_M_capacity,
				  __alloc);
      if (this->_M_length)
	_M_copy(__r->_M_refdata(), _M_refdata(), this->_M_length);

      __r->_M_set_length_and_sharable(this->_M_length);
      return __r->_M_refdata();
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    resize(size_type __n, _CharT __c)
    {
      const size_type __size = this->size();
      _M_check_length(__size, __n, "basic_string::resize");
      if (__size < __n)
	this->append(__n - __size, __c);
      else if (__n < __size)
	this->erase(__n);
      // else nothing (in particular, avoid calling _M_mutate() unnecessarily.)
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InputIterator>
      basic_string<_CharT, _Traits, _Alloc>&
      basic_string<_CharT, _Traits, _Alloc>::
      _M_replace_dispatch(iterator __i1, iterator __i2, _InputIterator __k1,
			  _InputIterator __k2, __false_type)
      {
	const basic_string __s(__k1, __k2);
	const size_type __n1 = __i2 - __i1;
	_M_check_length(__n1, __s.size(), "basic_string::_M_replace_dispatch");
	return _M_replace_safe(__i1 - _M_ibegin(), __n1, __s._M_data(),
			       __s.size());
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
		   _CharT __c)
    {
      _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");
      _M_mutate(__pos1, __n1, __n2);
      if (__n2)
	_M_assign(_M_data() + __pos1, __n2, __c);
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
		    size_type __n2)
    {
      _M_mutate(__pos1, __n1, __n2);
      if (__n2)
	_M_copy(_M_data() + __pos1, __s, __n2);
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>
    operator+(const _CharT* __lhs,
	      const basic_string<_CharT, _Traits, _Alloc>& __rhs)
    {
      __glibcxx_requires_string(__lhs);
      typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
      typedef typename __string_type::size_type	  __size_type;
      const __size_type __len = _Traits::length(__lhs);
      __string_type __str;
      __str.reserve(__len + __rhs.size());
      __str.append(__lhs, __len);
      __str.append(__rhs);
      return __str;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>
    operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
    {
      typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
      typedef typename __string_type::size_type	  __size_type;
      __string_type __str;
      const __size_type __len = __rhs.size();
      __str.reserve(__len + 1);
      __str.append(__size_type(1), __lhs);
      __str.append(__rhs);
      return __str;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    copy(_CharT* __s, size_type __n, size_type __pos) const
    {
      _M_check(__pos, "basic_string::copy");
      __n = _M_limit(__pos, __n);
      __glibcxx_requires_string_len(__s, __n);
      if (__n)
	_M_copy(__s, _M_data() + __pos, __n);
      // 21.3.5.7 par 3: do not append null.  (good.)
      return __n;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find(const _CharT* __s, size_type __pos, size_type __n) const
    {
      __glibcxx_requires_string_len(__s, __n);
      const size_type __size = this->size();
      const _CharT* __data = _M_data();

      if (__n == 0)
	return __pos <= __size ? __pos : npos;

      if (__n <= __size)
	{
	  for (; __pos <= __size - __n; ++__pos)
	    if (traits_type::eq(__data[__pos], __s[0])
		&& traits_type::compare(__data + __pos + 1,
					__s + 1, __n - 1) == 0)
	      return __pos;
	}
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find(_CharT __c, size_type __pos) const
    {
      size_type __ret = npos;
      const size_type __size = this->size();
      if (__pos < __size)
	{
	  const _CharT* __data = _M_data();
	  const size_type __n = __size - __pos;
	  const _CharT* __p = traits_type::find(__data + __pos, __n, __c);
	  if (__p)
	    __ret = __p - __data;
	}
      return __ret;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    rfind(const _CharT* __s, size_type __pos, size_type __n) const
    {
      __glibcxx_requires_string_len(__s, __n);
      const size_type __size = this->size();
      if (__n <= __size)
	{
	  __pos = std::min(size_type(__size - __n), __pos);
	  const _CharT* __data = _M_data();
	  do
	    {
	      if (traits_type::compare(__data + __pos, __s, __n) == 0)
		return __pos;
	    }
	  while (__pos-- > 0);
	}
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    rfind(_CharT __c, size_type __pos) const
    {
      size_type __size = this->size();
      if (__size)
	{
	  if (--__size > __pos)
	    __size = __pos;
	  for (++__size; __size-- > 0; )
	    if (traits_type::eq(_M_data()[__size], __c))
	      return __size;
	}
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
    {
      __glibcxx_requires_string_len(__s, __n);
      for (; __n && __pos < this->size(); ++__pos)
	{
	  const _CharT* __p = traits_type::find(__s, __n, _M_data()[__pos]);
	  if (__p)
	    return __pos;
	}
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
    {
      __glibcxx_requires_string_len(__s, __n);
      size_type __size = this->size();
      if (__size && __n)
	{
	  if (--__size > __pos)
	    __size = __pos;
	  do
	    {
	      if (traits_type::find(__s, __n, _M_data()[__size]))
		return __size;
	    }
	  while (__size-- != 0);
	}
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
    {
      __glibcxx_requires_string_len(__s, __n);
      for (; __pos < this->size(); ++__pos)
	if (!traits_type::find(__s, __n, _M_data()[__pos]))
	  return __pos;
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_first_not_of(_CharT __c, size_type __pos) const
    {
      for (; __pos < this->size(); ++__pos)
	if (!traits_type::eq(_M_data()[__pos], __c))
	  return __pos;
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
    {
      __glibcxx_requires_string_len(__s, __n);
      size_type __size = this->size();
      if (__size)
	{
	  if (--__size > __pos)
	    __size = __pos;
	  do
	    {
	      if (!traits_type::find(__s, __n, _M_data()[__size]))
		return __size;
	    }
	  while (__size--);
	}
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_last_not_of(_CharT __c, size_type __pos) const
    {
      size_type __size = this->size();
      if (__size)
	{
	  if (--__size > __pos)
	    __size = __pos;
	  do
	    {
	      if (!traits_type::eq(_M_data()[__size], __c))
		return __size;
	    }
	  while (__size--);
	}
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string<_CharT, _Traits, _Alloc>::
    compare(size_type __pos, size_type __n, const basic_string& __str) const
    {
      _M_check(__pos, "basic_string::compare");
      __n = _M_limit(__pos, __n);
      const size_type __osize = __str.size();
      const size_type __len = std::min(__n, __osize);
      int __r = traits_type::compare(_M_data() + __pos, __str.data(), __len);
      if (!__r)
	__r = __n - __osize;
      return __r;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string<_CharT, _Traits, _Alloc>::
    compare(size_type __pos1, size_type __n1, const basic_string& __str,
	    size_type __pos2, size_type __n2) const
    {
      _M_check(__pos1, "basic_string::compare");
      __str._M_check(__pos2, "basic_string::compare");
      __n1 = _M_limit(__pos1, __n1);
      __n2 = __str._M_limit(__pos2, __n2);
      const size_type __len = std::min(__n1, __n2);
      int __r = traits_type::compare(_M_data() + __pos1,
				     __str.data() + __pos2, __len);
      if (!__r)
	__r = __n1 - __n2;
      return __r;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string<_CharT, _Traits, _Alloc>::
    compare(const _CharT* __s) const
    {
      __glibcxx_requires_string(__s);
      const size_type __size = this->size();
      const size_type __osize = traits_type::length(__s);
      const size_type __len = std::min(__size, __osize);
      int __r = traits_type::compare(_M_data(), __s, __len);
      if (!__r)
	__r = __size - __osize;
      return __r;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string <_CharT, _Traits, _Alloc>::
    compare(size_type __pos, size_type __n1, const _CharT* __s) const
    {
      __glibcxx_requires_string(__s);
      _M_check(__pos, "basic_string::compare");
      __n1 = _M_limit(__pos, __n1);
      const size_type __osize = traits_type::length(__s);
      const size_type __len = std::min(__n1, __osize);
      int __r = traits_type::compare(_M_data() + __pos, __s, __len);
      if (!__r)
	__r = __n1 - __osize;
      return __r;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string <_CharT, _Traits, _Alloc>::
    compare(size_type __pos, size_type __n1, const _CharT* __s,
	    size_type __n2) const
    {
      __glibcxx_requires_string_len(__s, __n2);
      _M_check(__pos, "basic_string::compare");
      __n1 = _M_limit(__pos, __n1);
      const size_type __len = std::min(__n1, __n2);
      int __r = traits_type::compare(_M_data() + __pos, __s, __len);
      if (!__r)
	__r = __n1 - __n2;
      return __r;
    }

  // Inhibit implicit instantiations for required instantiations,
  // which are defined via explicit instantiations elsewhere.
  // NB: This syntax is a GNU extension.
#if _GLIBCXX_EXTERN_TEMPLATE
  extern template class basic_string<char>;
  extern template
    basic_istream<char>&
    operator>>(basic_istream<char>&, string&);
  extern template
    basic_ostream<char>&
    operator<<(basic_ostream<char>&, const string&);
  extern template
    basic_istream<char>&
    getline(basic_istream<char>&, string&, char);
  extern template
    basic_istream<char>&
    getline(basic_istream<char>&, string&);

#ifdef _GLIBCXX_USE_WCHAR_T
  extern template class basic_string<wchar_t>;
  extern template
    basic_istream<wchar_t>&
    operator>>(basic_istream<wchar_t>&, wstring&);
  extern template
    basic_ostream<wchar_t>&
    operator<<(basic_ostream<wchar_t>&, const wstring&);
  extern template
    basic_istream<wchar_t>&
    getline(basic_istream<wchar_t>&, wstring&, wchar_t);
  extern template
    basic_istream<wchar_t>&
    getline(basic_istream<wchar_t>&, wstring&);
#endif
#endif

_GLIBCXX_END_NAMESPACE

#endif


code:
// -*- C++ -*-

// Copyright (C) 2004, 2005 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

// (C) Copyright Jeremy Siek 2000. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
//

/** @file boost_concept_check.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

// GCC Note:  based on version 1.12.0 of the Boost library.

#ifndef _BOOST_CONCEPT_CHECK_H
#define _BOOST_CONCEPT_CHECK_H 1

#pragma GCC system_header

#include <cstddef>                // for ptrdiff_t, used next
#include <bits/stl_iterator_base_types.h>    // for traits and tags
#include <utility>                           // for pair<>

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

#define _IsUnused __attribute__ ((__unused__))

// When the C-C code is in use, we would like this function to do as little
// as possible at runtime, use as few resources as possible, and hopefully
// be elided out of existence... hmmm.
template <class _Concept>
inline void __function_requires()
{
  void (_Concept::*__x)() _IsUnused = &_Concept::__constraints;
}

// No definition: if this is referenced, there's a problem with
// the instantiating type not being one of the required integer types.
// Unfortunately, this results in a link-time error, not a compile-time error.
void __error_type_must_be_an_integer_type();
void __error_type_must_be_an_unsigned_integer_type();
void __error_type_must_be_a_signed_integer_type();

// ??? Should the "concept_checking*" structs begin with more than _ ?
#define _GLIBCXX_CLASS_REQUIRES(_type_var, _ns, _concept) \
  typedef void (_ns::_concept <_type_var>::* _func##_type_var##_concept)(); \
  template <_func##_type_var##_concept _Tp1> \
  struct _concept_checking##_type_var##_concept { }; \
  typedef _concept_checking##_type_var##_concept< \
    &_ns::_concept <_type_var>::__constraints> \
    _concept_checking_typedef##_type_var##_concept

#define _GLIBCXX_CLASS_REQUIRES2(_type_var1, _type_var2, _ns, _concept) \
  typedef void (_ns::_concept <_type_var1,_type_var2>::* _func##_type_var1##_type_var2##_concept)(); \
  template <_func##_type_var1##_type_var2##_concept _Tp1> \
  struct _concept_checking##_type_var1##_type_var2##_concept { }; \
  typedef _concept_checking##_type_var1##_type_var2##_concept< \
    &_ns::_concept <_type_var1,_type_var2>::__constraints> \
    _concept_checking_typedef##_type_var1##_type_var2##_concept

#define _GLIBCXX_CLASS_REQUIRES3(_type_var1, _type_var2, _type_var3, _ns, _concept) \
  typedef void (_ns::_concept <_type_var1,_type_var2,_type_var3>::* _func##_type_var1##_type_var2##_type_var3##_concept)(); \
  template <_func##_type_var1##_type_var2##_type_var3##_concept _Tp1> \
  struct _concept_checking##_type_var1##_type_var2##_type_var3##_concept { }; \
  typedef _concept_checking##_type_var1##_type_var2##_type_var3##_concept< \
    &_ns::_concept <_type_var1,_type_var2,_type_var3>::__constraints>  \
  _concept_checking_typedef##_type_var1##_type_var2##_type_var3##_concept

#define _GLIBCXX_CLASS_REQUIRES4(_type_var1, _type_var2, _type_var3, _type_var4, _ns, _concept) \
  typedef void (_ns::_concept <_type_var1,_type_var2,_type_var3,_type_var4>::* _func##_type_var1##_type_var2##_type_var3##_type_var4##_concept)(); \
  template <_func##_type_var1##_type_var2##_type_var3##_type_var4##_concept _Tp1> \
  struct _concept_checking##_type_var1##_type_var2##_type_var3##_type_var4##_concept { }; \
  typedef _concept_checking##_type_var1##_type_var2##_type_var3##_type_var4##_concept< \
  &_ns::_concept <_type_var1,_type_var2,_type_var3,_type_var4>::__constraints> \
    _concept_checking_typedef##_type_var1##_type_var2##_type_var3##_type_var4##_concept

template <class _Tp1, class _Tp2>
struct _Aux_require_same { };

template <class _Tp>
struct _Aux_require_same<_Tp,_Tp> { typedef _Tp _Type; };

  template <class _Tp1, class _Tp2>
  struct _SameTypeConcept
  {
    void __constraints() {
      typedef typename _Aux_require_same<_Tp1, _Tp2>::_Type _Required;
    }
  };

  template <class _Tp>
  struct _IntegerConcept {
    void __constraints() {
      __error_type_must_be_an_integer_type();
    }
  };
  template <> struct _IntegerConcept<short> { void __constraints() {} };
  template <> struct _IntegerConcept<unsigned short> { void __constraints(){} };
  template <> struct _IntegerConcept<int> { void __constraints() {} };
  template <> struct _IntegerConcept<unsigned int> { void __constraints() {} };
  template <> struct _IntegerConcept<long> { void __constraints() {} };
  template <> struct _IntegerConcept<unsigned long> { void __constraints() {} };
  template <> struct _IntegerConcept<long long> { void __constraints() {} };
  template <> struct _IntegerConcept<unsigned long long>
                                                { void __constraints() {} };

  template <class _Tp>
  struct _SignedIntegerConcept {
    void __constraints() {
      __error_type_must_be_a_signed_integer_type();
    }
  };
  template <> struct _SignedIntegerConcept<short> { void __constraints() {} };
  template <> struct _SignedIntegerConcept<int> { void __constraints() {} };
  template <> struct _SignedIntegerConcept<long> { void __constraints() {} };
  template <> struct _SignedIntegerConcept<long long> { void __constraints(){}};

  template <class _Tp>
  struct _UnsignedIntegerConcept {
    void __constraints() {
      __error_type_must_be_an_unsigned_integer_type();
    }
  };
  template <> struct _UnsignedIntegerConcept<unsigned short>
    { void __constraints() {} };
  template <> struct _UnsignedIntegerConcept<unsigned int>
    { void __constraints() {} };
  template <> struct _UnsignedIntegerConcept<unsigned long>
    { void __constraints() {} };
  template <> struct _UnsignedIntegerConcept<unsigned long long>
    { void __constraints() {} };

  //===========================================================================
  // Basic Concepts

  template <class _Tp>
  struct _DefaultConstructibleConcept
  {
    void __constraints() {
      _Tp __a _IsUnused;                // require default constructor
    }
  };

  template <class _Tp>
  struct _AssignableConcept
  {
    void __constraints() {
      __a = __a;                        // require assignment operator
      __const_constraints(__a);
    }
    void __const_constraints(const _Tp& __b) {
      __a = __b;                   // const required for argument to assignment
    }
    _Tp __a;
    // possibly should be "Tp* a;" and then dereference "a" in constraint
    // functions?  present way would require a default ctor, i think...
  };

  template <class _Tp>
  struct _CopyConstructibleConcept
  {
    void __constraints() {
      _Tp __a(__b);                     // require copy constructor
      _Tp* __ptr _IsUnused = &__a;      // require address of operator
      __const_constraints(__a);
    }
    void __const_constraints(const _Tp& __a) {
      _Tp __c _IsUnused(__a);           // require const copy constructor
      const _Tp* __ptr _IsUnused = &__a; // require const address of operator
    }
    _Tp __b;
  };

  // The SGI STL version of Assignable requires copy constructor and operator=
  template <class _Tp>
  struct _SGIAssignableConcept
  {
    void __constraints() {
      _Tp __b _IsUnused(__a);
      __a = __a;                        // require assignment operator
      __const_constraints(__a);
    }
    void __const_constraints(const _Tp& __b) {
      _Tp __c _IsUnused(__b);
      __a = __b;              // const required for argument to assignment
    }
    _Tp __a;
  };

  template <class _From, class _To>
  struct _ConvertibleConcept
  {
    void __constraints() {
      _To __y _IsUnused = __x;
    }
    _From __x;
  };

  // The C++ standard requirements for many concepts talk about return
  // types that must be "convertible to bool".  The problem with this
  // requirement is that it leaves the door open for evil proxies that
  // define things like operator|| with strange return types.  Two
  // possible solutions are:
  // 1) require the return type to be exactly bool
  // 2) stay with convertible to bool, and also
  //    specify stuff about all the logical operators.
  // For now we just test for convertible to bool.
  template <class _Tp>
  void __aux_require_boolean_expr(const _Tp& __t) {
    bool __x _IsUnused = __t;
  }

// FIXME
  template <class _Tp>
  struct _EqualityComparableConcept
  {
    void __constraints() {
      __aux_require_boolean_expr(__a == __b);
    }
    _Tp __a, __b;
  };

  template <class _Tp>
  struct _LessThanComparableConcept
  {
    void __constraints() {
      __aux_require_boolean_expr(__a < __b);
    }
    _Tp __a, __b;
  };

  // This is equivalent to SGI STL's LessThanComparable.
  template <class _Tp>
  struct _ComparableConcept
  {
    void __constraints() {
      __aux_require_boolean_expr(__a < __b);
      __aux_require_boolean_expr(__a > __b);
      __aux_require_boolean_expr(__a <= __b);
      __aux_require_boolean_expr(__a >= __b);
    }
    _Tp __a, __b;
  };

#define _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(_OP,_NAME) \
  template <class _First, class _Second> \
  struct _NAME { \
    void __constraints() { (void)__constraints_(); } \
    bool __constraints_() {  \
      return  __a _OP __b; \
    } \
    _First __a; \
    _Second __b; \
  }

#define _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(_OP,_NAME) \
  template <class _Ret, class _First, class _Second> \
  struct _NAME { \
    void __constraints() { (void)__constraints_(); } \
    _Ret __constraints_() {  \
      return __a _OP __b; \
    } \
    _First __a; \
    _Second __b; \
  }

  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(==, _EqualOpConcept);
  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(!=, _NotEqualOpConcept);
  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(<, _LessThanOpConcept);
  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(<=, _LessEqualOpConcept);
  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(>, _GreaterThanOpConcept);
  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(>=, _GreaterEqualOpConcept);

  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(+, _PlusOpConcept);
  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(*, _TimesOpConcept);
  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(/, _DivideOpConcept);
  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(-, _SubtractOpConcept);
  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(%, _ModOpConcept);

#undef _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT
#undef _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT

  //===========================================================================
  // Function Object Concepts

  template <class _Func, class _Return>
  struct _GeneratorConcept
  {
    void __constraints() {
      const _Return& __r _IsUnused = __f();// require operator() member function
    }
    _Func __f;
  };

  template <class _Func>
  struct _GeneratorConcept<_Func,void>
  {
    void __constraints() {
      __f();                            // require operator() member function
    }
    _Func __f;
  };

  template <class _Func, class _Return, class _Arg>
  struct _UnaryFunctionConcept
  {
    void __constraints() {
      __r = __f(__arg);                  // require operator()
    }
    _Func __f;
    _Arg __arg;
    _Return __r;
  };

  template <class _Func, class _Arg>
  struct _UnaryFunctionConcept<_Func, void, _Arg> {
    void __constraints() {
      __f(__arg);                       // require operator()
    }
    _Func __f;
    _Arg __arg;
  };

  template <class _Func, class _Return, class _First, class _Second>
  struct _BinaryFunctionConcept
  {
    void __constraints() {
      __r = __f(__first, __second);     // require operator()
    }
    _Func __f;
    _First __first;
    _Second __second;
    _Return __r;
  };

  template <class _Func, class _First, class _Second>
  struct _BinaryFunctionConcept<_Func, void, _First, _Second>
  {
    void __constraints() {
      __f(__first, __second);           // require operator()
    }
    _Func __f;
    _First __first;
    _Second __second;
  };

  template <class _Func, class _Arg>
  struct _UnaryPredicateConcept
  {
    void __constraints() {
      __aux_require_boolean_expr(__f(__arg)); // require op() returning bool
    }
    _Func __f;
    _Arg __arg;
  };

  template <class _Func, class _First, class _Second>
  struct _BinaryPredicateConcept
  {
    void __constraints() {
      __aux_require_boolean_expr(__f(__a, __b)); // require op() returning bool
    }
    _Func __f;
    _First __a;
    _Second __b;
  };

  // use this when functor is used inside a container class like std::set
  template <class _Func, class _First, class _Second>
  struct _Const_BinaryPredicateConcept {
    void __constraints() {
      __const_constraints(__f);
    }
    void __const_constraints(const _Func& __fun) {
      __function_requires<_BinaryPredicateConcept<_Func, _First, _Second> >();
      // operator() must be a const member function
      __aux_require_boolean_expr(__fun(__a, __b));
    }
    _Func __f;
    _First __a;
    _Second __b;
  };

  //===========================================================================
  // Iterator Concepts

  template <class _Tp>
  struct _TrivialIteratorConcept
  {
    void __constraints() {
//    __function_requires< _DefaultConstructibleConcept<_Tp> >();
      __function_requires< _AssignableConcept<_Tp> >();
      __function_requires< _EqualityComparableConcept<_Tp> >();
//      typedef typename std::iterator_traits<_Tp>::value_type _V;
      (void)*__i;                       // require dereference operator
    }
    _Tp __i;
  };

  template <class _Tp>
  struct _Mutable_TrivialIteratorConcept
  {
    void __constraints() {
      __function_requires< _TrivialIteratorConcept<_Tp> >();
      *__i = *__j;                      // require dereference and assignment
    }
    _Tp __i, __j;
  };

  template <class _Tp>
  struct _InputIteratorConcept
  {
    void __constraints() {
      __function_requires< _TrivialIteratorConcept<_Tp> >();
      // require iterator_traits typedef's
      typedef typename std::iterator_traits<_Tp>::difference_type _Diff;
//      __function_requires< _SignedIntegerConcept<_Diff> >();
      typedef typename std::iterator_traits<_Tp>::reference _Ref;
      typedef typename std::iterator_traits<_Tp>::pointer _Pt;
      typedef typename std::iterator_traits<_Tp>::iterator_category _Cat;
      __function_requires< _ConvertibleConcept<
        typename std::iterator_traits<_Tp>::iterator_category,
        std::input_iterator_tag> >();
      ++__i;                            // require preincrement operator
      __i++;                            // require postincrement operator
    }
    _Tp __i;
  };

  template <class _Tp, class _ValueT>
  struct _OutputIteratorConcept
  {
    void __constraints() {
      __function_requires< _AssignableConcept<_Tp> >();
      ++__i;                            // require preincrement operator
      __i++;                            // require postincrement operator
      *__i++ = __t;                     // require postincrement and assignment
    }
    _Tp __i;
    _ValueT __t;
  };

  template <class _Tp>
  struct _ForwardIteratorConcept
  {
    void __constraints() {
      __function_requires< _InputIteratorConcept<_Tp> >();
      __function_requires< _DefaultConstructibleConcept<_Tp> >();
      __function_requires< _ConvertibleConcept<
        typename std::iterator_traits<_Tp>::iterator_category,
        std::forward_iterator_tag> >();
      typedef typename std::iterator_traits<_Tp>::reference _Ref;
      _Ref __r _IsUnused = *__i;
    }
    _Tp __i;
  };

  template <class _Tp>
  struct _Mutable_ForwardIteratorConcept
  {
    void __constraints() {
      __function_requires< _ForwardIteratorConcept<_Tp> >();
      *__i++ = *__i;                    // require postincrement and assignment
    }
    _Tp __i;
  };

  template <class _Tp>
  struct _BidirectionalIteratorConcept
  {
    void __constraints() {
      __function_requires< _ForwardIteratorConcept<_Tp> >();
      __function_requires< _ConvertibleConcept<
        typename std::iterator_traits<_Tp>::iterator_category,
        std::bidirectional_iterator_tag> >();
      --__i;                            // require predecrement operator
      __i--;                            // require postdecrement operator
    }
    _Tp __i;
  };

  template <class _Tp>
  struct _Mutable_BidirectionalIteratorConcept
  {
    void __constraints() {
      __function_requires< _BidirectionalIteratorConcept<_Tp> >();
      __function_requires< _Mutable_ForwardIteratorConcept<_Tp> >();
      *__i-- = *__i;                    // require postdecrement and assignment
    }
    _Tp __i;
  };

  template <class _Tp>
  struct _RandomAccessIteratorConcept
  {
    void __constraints() {
      __function_requires< _BidirectionalIteratorConcept<_Tp> >();
      __function_requires< _ComparableConcept<_Tp> >();
      __function_requires< _ConvertibleConcept<
        typename std::iterator_traits<_Tp>::iterator_category,
        std::random_access_iterator_tag> >();
      // ??? We don't use _Ref, are we just checking for "referenceability"?
      typedef typename std::iterator_traits<_Tp>::reference _Ref;

      __i += __n;                       // require assignment addition operator
      __i = __i + __n; __i = __n + __i; // require addition with difference type
      __i -= __n;                       // require assignment subtraction op
      __i = __i - __n;                  // require subtraction with
                                        //            difference type
      __n = __i - __j;                  // require difference operator
      (void)__i[__n];                   // require element access operator
    }
    _Tp __a, __b;
    _Tp __i, __j;
    typename std::iterator_traits<_Tp>::difference_type __n;
  };

  template <class _Tp>
  struct _Mutable_RandomAccessIteratorConcept
  {
    void __constraints() {
      __function_requires< _RandomAccessIteratorConcept<_Tp> >();
      __function_requires< _Mutable_BidirectionalIteratorConcept<_Tp> >();
      __i[__n] = *__i;                  // require element access and assignment
    }
    _Tp __i;
    typename std::iterator_traits<_Tp>::difference_type __n;
  };

  //===========================================================================
  // Container Concepts

  template <class _Container>
  struct _ContainerConcept
  {
    typedef typename _Container::value_type _Value_type;
    typedef typename _Container::difference_type _Difference_type;
    typedef typename _Container::size_type _Size_type;
    typedef typename _Container::const_reference _Const_reference;
    typedef typename _Container::const_pointer _Const_pointer;
    typedef typename _Container::const_iterator _Const_iterator;

    void __constraints() {
      __function_requires< _InputIteratorConcept<_Const_iterator> >();
      __function_requires< _AssignableConcept<_Container> >();
      const _Container __c;
      __i = __c.begin();
      __i = __c.end();
      __n = __c.size();
      __n = __c.max_size();
      __b = __c.empty();
    }
    bool __b;
    _Const_iterator __i;
    _Size_type __n;
  };

  template <class _Container>
  struct _Mutable_ContainerConcept
  {
    typedef typename _Container::value_type _Value_type;
    typedef typename _Container::reference _Reference;
    typedef typename _Container::iterator _Iterator;
    typedef typename _Container::pointer _Pointer;

    void __constraints() {
      __function_requires< _ContainerConcept<_Container> >();
      __function_requires< _AssignableConcept<_Value_type> >();
      __function_requires< _InputIteratorConcept<_Iterator> >();

      __i = __c.begin();
      __i = __c.end();
      __c.swap(__c2);
    }
    _Iterator __i;
    _Container __c, __c2;
  };

  template <class _ForwardContainer>
  struct _ForwardContainerConcept
  {
    void __constraints() {
      __function_requires< _ContainerConcept<_ForwardContainer> >();
      typedef typename _ForwardContainer::const_iterator _Const_iterator;
      __function_requires< _ForwardIteratorConcept<_Const_iterator> >();
    }
  };

  template <class _ForwardContainer>
  struct _Mutable_ForwardContainerConcept
  {
    void __constraints() {
      __function_requires< _ForwardContainerConcept<_ForwardContainer> >();
      __function_requires< _Mutable_ContainerConcept<_ForwardContainer> >();
      typedef typename _ForwardContainer::iterator _Iterator;
      __function_requires< _Mutable_ForwardIteratorConcept<_Iterator> >();
    }
  };

  template <class _ReversibleContainer>
  struct _ReversibleContainerConcept
  {
    typedef typename _ReversibleContainer::const_iterator _Const_iterator;
    typedef typename _ReversibleContainer::const_reverse_iterator
      _Const_reverse_iterator;

    void __constraints() {
      __function_requires< _ForwardContainerConcept<_ReversibleContainer> >();
      __function_requires< _BidirectionalIteratorConcept<_Const_iterator> >();
      __function_requires<
        _BidirectionalIteratorConcept<_Const_reverse_iterator> >();

      const _ReversibleContainer __c;
      _Const_reverse_iterator __i = __c.rbegin();
      __i = __c.rend();
    }
  };

  template <class _ReversibleContainer>
  struct _Mutable_ReversibleContainerConcept
  {
    typedef typename _ReversibleContainer::iterator _Iterator;
    typedef typename _ReversibleContainer::reverse_iterator _Reverse_iterator;

    void __constraints() {
      __function_requires<_ReversibleContainerConcept<_ReversibleContainer> >();
      __function_requires<
        _Mutable_ForwardContainerConcept<_ReversibleContainer> >();
      __function_requires<_Mutable_BidirectionalIteratorConcept<_Iterator> >();
      __function_requires<
        _Mutable_BidirectionalIteratorConcept<_Reverse_iterator> >();

      _Reverse_iterator __i = __c.rbegin();
      __i = __c.rend();
    }
    _ReversibleContainer __c;
  };

  template <class _RandomAccessContainer>
  struct _RandomAccessContainerConcept
  {
    typedef typename _RandomAccessContainer::size_type _Size_type;
    typedef typename _RandomAccessContainer::const_reference _Const_reference;
    typedef typename _RandomAccessContainer::const_iterator _Const_iterator;
    typedef typename _RandomAccessContainer::const_reverse_iterator
      _Const_reverse_iterator;

    void __constraints() {
      __function_requires<
        _ReversibleContainerConcept<_RandomAccessContainer> >();
      __function_requires< _RandomAccessIteratorConcept<_Const_iterator> >();
      __function_requires<
        _RandomAccessIteratorConcept<_Const_reverse_iterator> >();

      const _RandomAccessContainer __c;
      _Const_reference __r _IsUnused = __c[__n];
    }
    _Size_type __n;
  };

  template <class _RandomAccessContainer>
  struct _Mutable_RandomAccessContainerConcept
  {
    typedef typename _RandomAccessContainer::size_type _Size_type;
    typedef typename _RandomAccessContainer::reference _Reference;
    typedef typename _RandomAccessContainer::iterator _Iterator;
    typedef typename _RandomAccessContainer::reverse_iterator _Reverse_iterator;

    void __constraints() {
      __function_requires<
        _RandomAccessContainerConcept<_RandomAccessContainer> >();
      __function_requires<
        _Mutable_ReversibleContainerConcept<_RandomAccessContainer> >();
      __function_requires< _Mutable_RandomAccessIteratorConcept<_Iterator> >();
      __function_requires<
        _Mutable_RandomAccessIteratorConcept<_Reverse_iterator> >();

      _Reference __r _IsUnused = __c[__i];
    }
    _Size_type __i;
    _RandomAccessContainer __c;
  };

  // A Sequence is inherently mutable
  template <class _Sequence>
  struct _SequenceConcept
  {
    typedef typename _Sequence::reference _Reference;
    typedef typename _Sequence::const_reference _Const_reference;

    void __constraints() {
      // Matt Austern's book puts DefaultConstructible here, the C++
      // standard places it in Container
      //    function_requires< DefaultConstructible<Sequence> >();
      __function_requires< _Mutable_ForwardContainerConcept<_Sequence> >();
      __function_requires< _DefaultConstructibleConcept<_Sequence> >();

      _Sequence
	__c _IsUnused(__n, __t),
        __c2 _IsUnused(__first, __last);

      __c.insert(__p, __t);
      __c.insert(__p, __n, __t);
      __c.insert(__p, __first, __last);

      __c.erase(__p);
      __c.erase(__p, __q);

      _Reference __r _IsUnused = __c.front();

      __const_constraints(__c);
    }
    void __const_constraints(const _Sequence& __c) {
      _Const_reference __r _IsUnused = __c.front();
    }
    typename _Sequence::value_type __t;
    typename _Sequence::size_type __n;
    typename _Sequence::value_type *__first, *__last;
    typename _Sequence::iterator __p, __q;
  };

  template <class _FrontInsertionSequence>
  struct _FrontInsertionSequenceConcept
  {
    void __constraints() {
      __function_requires< _SequenceConcept<_FrontInsertionSequence> >();

      __c.push_front(__t);
      __c.pop_front();
    }
    _FrontInsertionSequence __c;
    typename _FrontInsertionSequence::value_type __t;
  };

  template <class _BackInsertionSequence>
  struct _BackInsertionSequenceConcept
  {
    typedef typename _BackInsertionSequence::reference _Reference;
    typedef typename _BackInsertionSequence::const_reference _Const_reference;

    void __constraints() {
      __function_requires< _SequenceConcept<_BackInsertionSequence> >();

      __c.push_back(__t);
      __c.pop_back();
      _Reference __r _IsUnused = __c.back();
    }
    void __const_constraints(const _BackInsertionSequence& __c) {
      _Const_reference __r _IsUnused = __c.back();
    };
    _BackInsertionSequence __c;
    typename _BackInsertionSequence::value_type __t;
  };

  template <class _AssociativeContainer>
  struct _AssociativeContainerConcept
  {
    void __constraints() {
      __function_requires< _ForwardContainerConcept<_AssociativeContainer> >();
      __function_requires<
        _DefaultConstructibleConcept<_AssociativeContainer> >();

      __i = __c.find(__k);
      __r = __c.equal_range(__k);
      __c.erase(__k);
      __c.erase(__i);
      __c.erase(__r.first, __r.second);
      __const_constraints(__c);
    }
    void __const_constraints(const _AssociativeContainer& __c) {
      __ci = __c.find(__k);
      __n = __c.count(__k);
      __cr = __c.equal_range(__k);
    }
    typedef typename _AssociativeContainer::iterator _Iterator;
    typedef typename _AssociativeContainer::const_iterator _Const_iterator;

    _AssociativeContainer __c;
    _Iterator __i;
    std::pair<_Iterator,_Iterator> __r;
    _Const_iterator __ci;
    std::pair<_Const_iterator,_Const_iterator> __cr;
    typename _AssociativeContainer::key_type __k;
    typename _AssociativeContainer::size_type __n;
  };

  template <class _UniqueAssociativeContainer>
  struct _UniqueAssociativeContainerConcept
  {
    void __constraints() {
      __function_requires<
        _AssociativeContainerConcept<_UniqueAssociativeContainer> >();

      _UniqueAssociativeContainer __c(__first, __last);

      __pos_flag = __c.insert(__t);
      __c.insert(__first, __last);
    }
    std::pair<typename _UniqueAssociativeContainer::iterator, bool> __pos_flag;
    typename _UniqueAssociativeContainer::value_type __t;
    typename _UniqueAssociativeContainer::value_type *__first, *__last;
  };

  template <class _MultipleAssociativeContainer>
  struct _MultipleAssociativeContainerConcept
  {
    void __constraints() {
      __function_requires<
        _AssociativeContainerConcept<_MultipleAssociativeContainer> >();

      _MultipleAssociativeContainer __c(__first, __last);

      __pos = __c.insert(__t);
      __c.insert(__first, __last);

    }
    typename _MultipleAssociativeContainer::iterator __pos;
    typename _MultipleAssociativeContainer::value_type __t;
    typename _MultipleAssociativeContainer::value_type *__first, *__last;
  };

  template <class _SimpleAssociativeContainer>
  struct _SimpleAssociativeContainerConcept
  {
    void __constraints() {
      __function_requires<
        _AssociativeContainerConcept<_SimpleAssociativeContainer> >();
      typedef typename _SimpleAssociativeContainer::key_type _Key_type;
      typedef typename _SimpleAssociativeContainer::value_type _Value_type;
      typedef typename _Aux_require_same<_Key_type, _Value_type>::_Type
        _Required;
    }
  };

  template <class _SimpleAssociativeContainer>
  struct _PairAssociativeContainerConcept
  {
    void __constraints() {
      __function_requires<
        _AssociativeContainerConcept<_SimpleAssociativeContainer> >();
      typedef typename _SimpleAssociativeContainer::key_type _Key_type;
      typedef typename _SimpleAssociativeContainer::value_type _Value_type;
      typedef typename _SimpleAssociativeContainer::mapped_type _Mapped_type;
      typedef std::pair<const _Key_type, _Mapped_type> _Required_value_type;
      typedef typename _Aux_require_same<_Value_type,
        _Required_value_type>::_Type _Required;
    }
  };

  template <class _SortedAssociativeContainer>
  struct _SortedAssociativeContainerConcept
  {
    void __constraints() {
      __function_requires<
        _AssociativeContainerConcept<_SortedAssociativeContainer> >();
      __function_requires<
        _ReversibleContainerConcept<_SortedAssociativeContainer> >();

      _SortedAssociativeContainer
        __c _IsUnused(__kc),
        __c2 _IsUnused(__first, __last),
        __c3 _IsUnused(__first, __last, __kc);

      __p = __c.upper_bound(__k);
      __p = __c.lower_bound(__k);
      __r = __c.equal_range(__k);

      __c.insert(__p, __t);
    }
    void __const_constraints(const _SortedAssociativeContainer& __c) {
      __kc = __c.key_comp();
      __vc = __c.value_comp();

      __cp = __c.upper_bound(__k);
      __cp = __c.lower_bound(__k);
      __cr = __c.equal_range(__k);
    }
    typename _SortedAssociativeContainer::key_compare __kc;
    typename _SortedAssociativeContainer::value_compare __vc;
    typename _SortedAssociativeContainer::value_type __t;
    typename _SortedAssociativeContainer::key_type __k;
    typedef typename _SortedAssociativeContainer::iterator _Iterator;
    typedef typename _SortedAssociativeContainer::const_iterator
      _Const_iterator;

    _Iterator __p;
    _Const_iterator __cp;
    std::pair<_Iterator,_Iterator> __r;
    std::pair<_Const_iterator,_Const_iterator> __cr;
    typename _SortedAssociativeContainer::value_type *__first, *__last;
  };

  // HashedAssociativeContainer

_GLIBCXX_END_NAMESPACE

#undef _IsUnused

#endif // _GLIBCXX_BOOST_CONCEPT_CHECK

repo_name: veiledmerc/mira

license: mit


code:
// Base to std::allocator -*- C++ -*-

// Copyright (C) 2004, 2005 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

/** @file c++allocator.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef _CXX_ALLOCATOR_H
#define _CXX_ALLOCATOR_H 1

// Define new_allocator as the base class to std::allocator.
#include <ext/new_allocator.h>
#define __glibcxx_base_allocator  __gnu_cxx::new_allocator

#endif